I'm an avid runner and this shirt has great moisture wicking capabilities, as well as, temperature regulating performance. I have used this shirt in 50-80 degree temps and the shirt performs well and fits true to size. The only drawback is the sleeve seams ride through the center of your armpit...which can cause irritation. I may send the shirt back ask for a replacement to see if it was a manufacturing problem. I would have given the shirt 5 stars except for the seam issue.